Ideal Weight Calculator

Ideal body weight formulas give a rough reference weight based on height and sex. This calculator shows four classic formulas (Devine, Robinson, Miller and Hamwi), their average, and the weight range that corresponds to a healthy BMI.

Last reviewed: 12 November 2026

Average of the four formulas: 65.9 kg
Devine formula: 65.9 kg
Robinson formula: 65.2 kg
Miller formula: 66 kg
Hamwi formula: 66.7 kg
Healthy BMI range (18.5–24.9): 53.5 – 72 kg

There is no single ideal weight. Use these figures as a rough guide, not a target.

None of them is a target to chase. They were created for clinical dosing and general reference, so treat them as a guide.

How to use this calculator

Select your sex.
Enter your height in centimetres.
Compare the four formula results and their average.
Check the BMI-based healthy range, which allows for more variation.

Formula and variables

Devine (male) = 50 + 2.3 × inches over 5 ft; (female) = 45.5 + 2.3 × inches over 5 ft Robinson: male 52 + 1.9, female 49 + 1.7 Miller: male 56.2 + 1.41, female 53.1 + 1.36 Hamwi: male 48 + 2.7, female 45.5 + 2.2

Inches over 5 ft - height in inches minus 60 (height in cm ÷ 2.54 − 60).
Result - ideal weight in kilograms.

Worked example

A man who is 170 cm tall (about 66.9 inches).

Inputs and results for the worked example
Sex	Male
Height	170 cm
Devine	65.9 kg
Robinson	65.2 kg
Miller	66.0 kg
Hamwi	66.7 kg
Average	65.9 kg

170 ÷ 2.54 = 66.93 inches, which is 6.93 inches over 5 ft.
Devine: 50 + 2.3 × 6.93 = 65.9 kg.
The four results are averaged to give 65.9 kg.

What changes the result

Frame size and muscle. People with a larger frame or more muscle can be healthy above these figures.
Age. These formulas do not adjust for age.
Ethnicity. They were developed mainly on Western populations and may not suit South Asians.
Height range. They are least reliable under 5 ft (152 cm) or for very tall people.

Benefits and practical uses

Several formulas compared in one place.
A BMI-based range for realistic flexibility.
A reference for dietitian or doctor conversations.

Assumptions and limitations

Designed for adults.
Results are rough reference points and not medical advice.
The healthy BMI range uses WHO limits of 18.5 to 24.9.

Frequently asked questions

What is ideal body weight?

A reference weight estimated from height and sex. It is a rough guide and not a personal target.

Which formula is most accurate?

None is considered best. They give similar results around average height, so the calculator shows all four and their average.

Are these formulas right for Indians?

They were derived mostly from Western data, so a lower BMI-based range may suit South Asians better. See the BMI calculator.

Why does my weight differ from the result?

Muscle, bone density, frame size and age cause healthy variation.

Should I aim for the ideal weight?

Focus on health habits and talk to a doctor. A single number should not be the goal.

References

Page last reviewed on 12 November 2026. This calculator gives estimates for planning only; it is not financial advice and not an offer from any lender.